METHOD OF OBTAINING BLENDED CEMENT WITH LOWER EMISSION OF CARBON DIOXIDE Russian patent published in 2008 - IPC C04B7/00 C04B28/02 

FIELD: chemistry.

SUBSTANCE: blended cement consists of Portland cement, carefully mixed with a micro-filler and, possibly, an agent for lowering water content, dry cement and fine secondary materials. In the first stage, the secondary materials are ground up under dry conditions with obtaining of a specific surface area of at least, 1000 cm²/g. In the second stage, the secondary materials are mixed with at least 20% mass of ground up highly reactive cement mixture under dry conditions, with obtaining of specific surface area of at least 3000 cm²/g. The stated cement mixture contains cement and at least, one of the micro-filler components, containing SiO₂ and a polymer in form of a powdered agent for lowering water content. This mixture is preliminarily processed in a grinding device with vibrating grinding equipment, in which the particles of the cement are subjected to the effect of impact pulses.

EFFECT: lowering of carbon dioxide emissions and increased strength and wear-resistance.

7 cl, 6 tbl, 1 dwg